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BIO NMDCAT Muscles
nmdcat.online July 28, 2026

During the evolutionary development of the vertebrate muscular system, a specific muscle type evolved to function independently of conscious control while maintaining the structural strength provided by sarcomeres. This tissue is:

A. Skeletal muscle
B. Cardiac muscle
✓
C. Smooth muscle
D. Visceral muscle

📝 Explanation

Cardiac muscle evolved to combine the involuntary, continuous activity characteristic of smooth muscle (autonomic control) with the high contractile strength and organized sarcomere structure characteristic of striated skeletal muscle.

📖 Additional Information

  • Skeletal muscle
  • Cardiac muscle
  • Smooth muscle
  • Visceral muscle

Cardiac muscle evolved to combine the involuntary, continuous activity characteristic of smooth muscle (autonomic control) with the high contractile strength and organized sarcomere structure characteristic of striated skeletal muscle.

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Among the following statements comparing multi-unit and single-unit smooth muscle, which is correct?

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A biological comparison of muscle cell nuclei reveals that while smooth and cardiac muscles generally have single, centrally located nuclei, skeletal muscle cells are multinucleated. The most appropriate explanation for this multinucleation is:

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